<!DOCTYPE html>
<html>
<head>
    <title></title>
    <meta charset="utf-8">
    <script src="http://libs.baidu.com/jquery/1.9.1/jquery.min.js"></script>
</head>
<style type="text/css">
    form{
        width: 300px;
        padding: 10px 0px 20px 30px;
        height:auto;
        border-radius: 6px;
        border-left:8px solid #19a049;
        background:#eee;
        margin:100px auto;
    }
    #user,#pass{
        padding: 8px;
        outline: none;
        background: transparent;
        border:1px solid #999;
        margin-top: 5px;
    }
    #sub{
        padding: 6px;
        outline: none;
        border:none;
        background: #19a049;
        color:#fff;
        width: 150px;
        border-radius: 6px;
        cursor: pointer;
    }
</style>
<body>
    <form action="" method="" onsubmit="return loginBtn_click();">
        <h3>Log in</h3>
        <input type="text" name="user" placeholder="user" id="user">
        <input type="password" name="pass" placeholder="password" id="pass">
        <input type="checkbox" id="remember" checked><br/><br/>
        <input type="submit" id="sub">
    </form>
</body>
<script type="text/javascript">
    $(document).ready(function(){

        var strName = localStorage.getItem('keyName');
        var strPass = localStorage.getItem('keyPass');
        if(strName){
            $('#user').val(strName);
        }if(strPass){
            $('#pass').val(strPass);
        }

    });

    function loginBtn_click(){
            var strName = $('#user').val();
            var strPass = $('#pass').val();
            localStorage.setItem('keyName',strName);
            if($('#remember').is(':checked')){
                localStorage.setItem('keyPass',strPass);
            }else{
                localStorage.removeItem('keyPass');
            }
        }
</script>
</html>
